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Besides cultural and people-to-people cooperation, local cooperation has also played an important role in China-Czech relationship in recent two years.

"But these are the problems of cities that people want to be in, they're good problems to have and good problems to solve," said Garcetti.

Zhang said that China and the United States have issued three joint statements on climate change over the past few years, and both have played key roles in securing the adoption of the Paris Agreement. All of these developments indicate that the two countries could achieve win-win results in dealing with global challenges through cooperation.

Key, for his part, said current New Zealand-China relations are enjoying a full and in-depth development with fruitful results achieved in all fields and at all levels.

BEIJING, April 22 (Xinhua) -- Chinese President Xi Jinping has asked the country's higher education institutes to ensure that graduates demonstrate both moral and technical excellence in a letter congratulating Tsinghua University on its 105th anniversary.